Essex Duvet Covers by Matouk. Essex bedding brings two smart lines of satin stitch embroidery to the Sierra sheeting, in long-staple cotton percale. With tonal colors and crisp design, Essex adds a smart look to any bedroom. Fitted Sheets are Sierra and may be added to your cart here. To Launder your Matouk Bedding: Machine Wash Warm. Do Not Use Bleach or Fabric Softener. Tumble Dry Low Heat. Iron as Needed. Made in India of 350 thread count long-staple cotton.